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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Before and After Tax Amounts by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Change in unrealized gain (loss) on securities: |  |  |  |  |  |
Change in net unrealized gain (loss) during the period | $ (33,157) |  | $ 8,966 |  | $ (103,288) | $ (6,568)
Reclassification adjustment for net gains included in net gain on securities and other assets |  |  | (20) |  |  | (1,207)
Accretion of net unrealized loss on securities transferred to held to maturity | 829 |  |  |  | 999 |
Net change | (32,328) |  | 8,946 |  | (102,289) | (7,775)
Tax (benefit) expense | (10,169) |  | 2,817 |  | (32,171) | (2,512)
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | (22,159) |  | 6,129 |  | (70,118) | (5,263)
Change in pension and other postretirement obligations: |  |  |  |  |  |
Reclassification adjustment for expense included in other expense | (936) |  | (438) |  | (1,870) | (860)
Reclassification adjustment for curtailment loss |  |  |  |  |  | 1,543
Change in the net actuarial gain | 998 |  | 644 |  | 1,995 | 1,529
Net change | 62 |  | 206 |  | 125 | 2,212
Tax expense | 18 |  | 95 |  | 39 | 730
Net change in pension and other postretirement obligations | 44 |  | 111 |  | 86 | 1,482
Change in unrealized gain (loss) on derivatives: |  |  |  |  |  |
Change in net unrealized gain (loss) during the period | 2,309 |  | (1,406) |  | 9,161 | 3,542
Reclassification adjustment for loss included in loss on termination of derivatives |  |  |  |  |  | 16,505
Reclassification adjustment for expense included in interest expense | (54) |  | 10 |  | (23) | 864
Net change | 2,255 |  | (1,396) |  | 9,138 | 20,911
Tax (benefit) expense | 710 |  | 799 |  | 2,875 | 6,630
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | 1,545 |  | (2,195) |  | 6,263 | 14,281
Total other comprehensive (loss) income, net of tax | $ (20,570) | $ (43,199) | $ 4,045 | $ 6,455 | $ (63,769) | $ 10,500

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